Electric meter.



P. ROSE.

ELECTRIC METER.

APPLIOATION FILED SEPT. 1, 1911.

1,085,163, Patented Jan. 27, 1914.-

I VZTNESEES I .JJVYENTUR Hm: FUSE I I J :51. 711 5, A z'rmnagt UNITED STATES PATENT OFFICE. PAUL mass, or BERLIN: GERMANY, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A.

, conronn'rron or NEW YonK. I

ELECTRIC METER.

Applicafidn filed- September 1, 1911.

To all whom it may concern -Be it known that I, PAUL Rose, a subject of the Emperor of Germany, residing at Berlin, Germany, have invented certain new and useful Improvements in Electric Meters,

of which the following is aspecification.

be measured. and the ObJQCl] of my invention. is the con- My invention relates to electric meters with oscillating armatures and has for its object an improvement in such devices.

More specifically, my invention relates to direct current watthour meters, with oscillating armaturcs, in which the driving power depends on the action of two liclds, one of Much is proportional to the mam current and the other to the voltage in the circuit to Such meters are well known struction of an improved form of the same.

Iaccomplish this object by the use of a magnetic member having a certain, rcmaneut magnetization which is periodically or intermittently dei'nagnetized by short current impulses produced in a magnetizing coil surrounding the same.

For a further understanding of my inven tion, reference may be had to the accon1- panying drawings, where- Flgure 1 shows diagrammatically and partially in section the main portions of a meter embodymg' my invention, and Fig. 2 is a vertical View of the same taken from. a different position.

Referring to the figures, 1 are current coils shown as conne ted in series with the circuit to be measured, fixed in position and formiiig apeimanent'field. In operative relation with these coils or licld is a magnetic member 2, which always possesses a certain remanent magnetization. This n'iagnetic member is attached to a shaft 3 in such a fashion that it may be readily oscillatable. Surrounding the magnetic member are two magnetizing coils 4 connected in series, the free ends of the windings beingTconnec-ted to two contact arms 5 which are rigidly attached in 'any suitable manner to shaft 3. Each of these contact arms at the end 01"" an oscillation of the shaft and magnetic membef makcs contact with fixed contacts 6, ll

.or '7, 7'. \Vhen sur-li'coiitzwts are made,

during the time of contact. a current lion's through the coils l proptu'timiai to the volt age of the circuit to be measured. When such a current flows, it imparts to the member 2 a magnetization causing the member to Specification of Letters Patent.

Patented Jan. 27, 1914. Serial No. 647,154.

move, and, as may readily be seen from an inspection of the drawings, thus breaking the contacts formed between arms 5 and contacts 6,6 or 7, 7, as the case may be. When the magnetic member and shaft have completed an oscillation, arms 5 will come in contact with the fixed contacts with which they have previously not been in contact and a magnetizing current will flow through the COIlS in a reverse direction to that which flowed previously, thus causing the magnetic member to reverse its direction of retation and movein a direction contrary to that in which it has already moved. It is of course understood that the direction of rotation of the magnetic member is reversed by eiiecting a reversal of the magnetic po-' larity of the member. From an inspection of the drawings, it will be seen that the current flowing in the windings of coils 4 when contacts 5-43. engage contacts 6--6 is opposite in direction to that which flows when contacts 55 engage contacts 7-7.. The magnetic polarity of the member 2, therefore, dependsupon whether contacts5-5 have last engaged contacts 6-6' or 7--7-., The magnetic member is constructed of suitable material, preferably iron, adapted to retain in a permanent form some of the magnetism imparted-tc it. The magnetic memsis 'ber thus always possesses a certain remanent magnetization tending to turn it in one-direction or the other. When current flows 1n the coils 1, the magnetic member will always tend to turn so that contacts 55 engage contacts 6-6 or '77, depending upon the magnetic polarity of the member. When such engagementis efi'ectedthe memher 2 is demagnetized with respect to the polarity last imparted to it and is simultaneously remagnetized with opposite p0- larity. Atterthe interruption of the mag- 'netizing current, the field formed by the remanent magnetism of the iron of the magnetic member in connection with the fixed field. of the main current coils then con tinues the oscillatory movement until c011- tact has been effected at the end of an oscil lotion and the magnetization inthe reverse direction takes 1; u-.e as has. alread been explained. A suitable damping mechanism, such as a disk 8' in operative relation with a permanent magnet 9 may be provided. It will be seen that the duration of the current impulses, which cause demagne I/ation,

and subsequent remagnetization of opposite polarityis small in comparison with the time elapsing between two successive impulses. Since the magnetizing coils are fed by a current proportional to'the voltage and the lined coils by current proportional to the current in the circuit to be measured, it will be obvious that the torque between the fixed and moving members wnrbe proportional to the watts in the circuit and that the meter will therefore operate as a watthour meter.

\Vhile I have described a preferred embodiment of my invention, I do not limit myself to this embodiment, but seek in the appended claims to cover all embodiments which will l)G 0bVlO1lS to those skilled in the art and not depart from the spirit of my invention.

.lVhat claim as new, and desireto secure by Letters Patent of the United States, is,-

1. A meter comprising in combination a fixed coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, and means for intermittently demagnetizing said member.

An electric'meter comprising in combination a fixed coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, and means for intermittently reversing the magnetic polarity of said member.

3. An electric meter comprising in combination a fixed coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, and-means for intermittei'itly demagnetizing said member and for imparting to the member a magnetization of opposite polarity.

4-. A meter comprising in combination a lixed coil, an oscillating magnetic member having a remane'nt magnetization in operative relation therewith, a coil surrounding said member, and means for intermittently energizing said coil.

5. A meter comprising in combination a fixed coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, a coil surrounding said member, and means for intermittently energizing said coil with current flowing in reverse directions.

6. A watthour meter comprising in combi-.

nation a coil, a magnetic member havin a remancnt magnetization in operative re 8.- tion therewith, a second coil surrounding said member, nieans for continuously energizing the first coil with a currentpropob tional to the current in the circuit to be measured, and means for intermittently energizing" the second coil with a current proportional to the voltage of the circuitto be rmrasurcd.

, T. A. watthour meter comprising in combination a fixed current coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, a coil surrounding said member, and means for intermittently energizing said coil with a current proportional to the voltage of the circuit to be measured.

' 8. A, watthour meter comprising in combination a fixed current coil, an'oscillating magnetic member having a remanent magnetization'in operative relation therewith, a coil surroimd'ing said member, and means for intermittently energizing said coil in reverse directions with a current proportional to the voltage otthe circuit to be measured.

9. A \vatthour 'meter comprising in combination a fixed current coil, an oscillating magnetic member having a remanent magnetization in operative relation therewith, a coil surrounding said member, and means dependent upon the movement of the'memher for intermittently energizing said coil with a current proportional to the voltage of the circuit to be measured.

10. A watthour meter comprising in combination a fixed current coil, an oscillating magnetic member having a remancnt magnetization in operative relation therewith, a coil surrounding said member, and means dependent upon the movement of the member for intermittently energizing said coil in reverse directions with a current proporlional to the voltage of the circuit to be measured.

In witness whereof, I have hereunto set my hand this 15th day of August, 1911.

PA UL ROSE.

\Vitnesses JULIUS Rtinnann, ALFRED I lVoLt. 

